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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 392 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.40 + ? = 100
  2. 2.27 + ? = 100
  3. 3.9 + ? = 10
  4. 4.4 + ? = 10
  5. 5.1 + ? = 10
  6. 6.33 + ? = 100
  7. 7.51 + ? = 100
  8. 8.3 + ? = 10
  9. 9.68 + ? = 100
  10. 10.55 + ? = 100
  11. 11.11 + ? = 100
  12. 12.83 + ? = 100
  13. 13.8 + ? = 10
  14. 14.48 + ? = 100
  15. 15.22 + ? = 100
  16. 16.37 + ? = 100
  17. 17.56 + ? = 100
  18. 18.16 + ? = 100
  19. 19.7 + ? = 10
  20. 20.38 + ? = 100
  21. 21.63 + ? = 100
  22. 22.81 + ? = 100
  23. 23.5 + ? = 10
  24. 24.2 + ? = 10
  25. 25.67 + ? = 100
  26. 26.70 + ? = 100
  27. 27.41 + ? = 100
  28. 28.24 + ? = 100
  29. 29.29 + ? = 100
  30. 30.28 + ? = 100
  31. 31.76 + ? = 100
  32. 32.65 + ? = 100
  33. 33.32 + ? = 100
  34. 34.14 + ? = 100
  35. 35.35 + ? = 100
  36. 36.15 + ? = 100
  37. 37.6 + ? = 10
  38. 38.45 + ? = 100
  39. 39.59 + ? = 100
  40. 40.39 + ? = 100

Answer key

  1. 60
  2. 73
  3. 1
  4. 6
  5. 9
  6. 67
  7. 49
  8. 7
  9. 32
  10. 45
  11. 89
  12. 17
  13. 2
  14. 52
  15. 78
  16. 63
  17. 44
  18. 84
  19. 3
  20. 62
  21. 37
  22. 19
  23. 5
  24. 8
  25. 33
  26. 30
  27. 59
  28. 76
  29. 71
  30. 72
  31. 24
  32. 35
  33. 68
  34. 86
  35. 65
  36. 85
  37. 4
  38. 55
  39. 41
  40. 61

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